Quote Originally Posted by magnarc View Post
23739 should be a G cone, tho I've a driver with that cone but with a 16 ohm coil.
21184 is generally the cone part for the 515B 416 604E.
If I'm not mistaken there are 2 variants of the 21184 cones (21184-2 & 21184-4) The 21184-4 goes with the 416 and the -2 515 respectively IIRC.